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FRANK I). IBELKNAP, OF NEW YORK, N. Y. Shanon-arisen.

NoDrawing.

Specification 0! Letters Patent..

To all whom'it may concern Be it known that I, FRANK D. 'BELKNAP, a citizen of the United States of America, residing atNew York city, borough of Manhattan,county and State of New York, have invented certain new and useful Improve-- ments in Stencil-Sheets, of which the following is a specification.

My invention comprises an improved stencil and the sheet from which said stencil may be made by the operation" of an ordinary typewriting machine or similar apparat-us. Stencils have been heretofore produced by treating loose fibered papers with various compositions but all of these have been subject to serious disadvantages. Paper treated with wax or parafi in is liable to injury by wrinkling, bending or breaking, the ink in the after operation penetratingthe paper alongthelines of breakage, thus producing inferior or useless results. In addition to this disadvantage, it has been found that they are'not capable ofa sufii' cient number of repeated uses and that they deteriorate very badly with age. Attempts have been made to use other compositions which would avoid these particular defects, butthe sheets'thus produced. require to be moistened before the stencil impressions can be properly formed therein.

The primary object of my invention is to produce a sheet capable of being stencilized, formed by treatipzg a sheet of loose fibered material such as oshino paper, with a suitable substance, or combination of substances, so that the stencil characters may be formed without previous dampening of the sheet and which will. not be damaged by wrinkling, bending or breaking, as is the case with papers now upon the market.

' The resultant product of my invention forms a most eiiicient stencil blank which can be stencilized in an ordinary typewriting machine without remoistening and without injury by ordinary handling or injury to typewriter by water. The stencil sheets so formed can be used to produce an indefinite number of copies, either by hand or in any suitable machine, and will not appreciably deteriorate from age, usage, or ordinary handling.

When a sheet of paper treated with my improved process is operated on by an ordinary type 'riter or equivalent apparatus, the material incasing and permeating the fibers of the paper is forced aside wherever the type strikes the sheet, thus leaving the'loose fibers of the paper practically bare at those p ints. When ink is applied to one side of 5 s sheet it passes through these exposed s rfaces of fiber and the characters which have been impressed on the stencil sheet are thus inked on a sheet of paper or other surface placed beneath, the resulting characters closely reproducing those which would have been printed thereon if the sheet of paper had been used in the typewriter in the usual way.

Broadly stated, my invention comprises the saturation of a sheet of loose fibered material, for instance Yoshino paper, with a gelatinous material, such as commercial gelatin, Irish moss, vegetable gum, either alone or in mixtures with each other, a salt of fatty acid, such as soap and a hygroscopic substance, such as glycerin. Preferably, an oxidizing agent, such as hydrogen peroxid,

Patented June 23, 1914,. Application filed May 4, 1912. Serial No. 395,309.

is also employed as a purifier and coagulant.

In carrying out my lnvention in its best form. as at present known to me, I take, one ounce of castile soap (or the equivalent amount of ingredients of said soap, 6. e., olive oiland caustic soda), 2 ounces of glycerin, 4 ounces of animal gelatin, (or 2 ounces of gelatin and 2 ounces of Irish moss) and about 120 ounces of water. This mixture is thoroughly dissolved and mixed under the influence of heat. On'the surface of this solution, preferably warm, is laid a sheet of Yoshino paper, which immediately absorbs the necessary quantity of the solution. In removing the sheet, it is advisable to draw it over sharp, straight edges of metal to insure a uniform distribution of the material on its surface. After the sheet has been dried by exposure to the atmosphere or otherwise, it is subjected to a second bath, preferably, at the room temperature, composed of l ounce of hydrogen peroxid and '2 ounces of glycerin, dissolved in about 6 ounces of water, and the sheet is again allowed to dry. So far as I am at present advised the principal functions of the soap included in the foregoing formula are to act as a softening agent and also to increase the imperviousness of the film formed on the paper. It seems to heighten the imperviousness of the film by acting as an ink repellent, preventing the ink being sucked by capillary action through occasional pores of the treated sheet. I believe that the soap also has a minor beneficial acis advisable that the temperature of the bath should be somewhat lower than has been found advisable where the second bath operation is employed. Certain of the in redients above specified can be omitted without departing from my invention and without destroying the usefulness of the product, but the best results that I have thus far obtained are produced by following the procedure above outlined.

Claims.

1. A stencil sheet formed of a base of loose fibered paper treated with solutions comprising glycerin, a gelatinous material,"

castile soap and hydrogen peroxid.

2. A stencil sheet formed of a base of loose fibered material saturated with an aqueous solution comprising a gelatinous material, glycerin and a vegetable soap. I

3. A blank capable of being stencilized comprising a loose fibered paper as a base and a coating comprising a gelatinous material, glycerin, castile soap and hydrogen peroxid.

4. A blank capable of being stencilized comprising a loose fibered paper as a base and a coating comprising a gelatinous material, glycerin, and a vegetable soap.

5. A blank capable of being stencilized comprising a'base of Ydshino paper, saturated with a composition comprising gelatin, glycerin, a vegetable oil, a caustic alkali, and hydrogen peroxid.

6. A blank capable of being stencilized comprising a sheet of loose fibered material treated with animal gelatin, Irish moss, glycerin and a salt of a fatty acid.

7. A blank capable of being stencilized comprising a sheet of loose fibered material treated with animal gelatin, Irish moss, glycerin, a salt of a fatty acid and an oxidizing agent.

8. A blank capable of being stencilized comprising a sheet of loose fibered material treated with a gelatinous material, a salt of a fatty acid, and a hygroscopic substance. i

9. A blank capable of being stencilized,

' comprisin comprising a sheet of loose fibered material 11. A blank capable of being stencilized,

comprising a sheet of loose fibered material treated with a gelatinous material, analkali salt of a fatty acid, and glycerin.

12. A blank capable of being stencilized,

comprising a sheet of loose fibered material treated with a elatinous material, a saponified fat, and a ygroscopic substance. 13. A blank capable of being stencilized, comprising a sheet of loose fibered material treated with a gelatinous material saponi- I lied olive oil, and g1 cerinl, I

14. A blank capa 1c of being stencilized, comprising a sheet of loose fibered material treated with a gelatinous material, asalt of a fatty acid, a hygroscopic substance, an d an oxidizing agent.

15. A blank capable of being stencilized, comprising a sheet of loose fibered materiali treated with a gelatinous material, a salt 0 a fatty acid, glycerin, and an oxidizing;

agent.

16. A blank capable of being stencilized, a sheet of loose fibered material treated with a gelatinous material, a salt of a fatty acid,'glycerin, and hydrogen peroxid. T

17. A blank capable of being stencilized, comprising a sheet of loose fibered material treated with a gelatinous material, an alkali peroxid.

18. A blank capable of being stencilized, comprising a sheet of loose fibered material treated with a gelatinous material, saponified olive oil, glycerin, and hydrogen peroxid.

19. A blank capable of being stencilized, comprising a sheet of loose fibered material treated with a gelatinous material, an alkali salt of a fatty acid, a hygroscopic substance and an oxidizing agent.

20. A sheet capable of being stencilized by printing type without the external application of moisture, comprising a thin, loose fibered sheet of paper treated with gelatin, glycerin, Irish mossand a coagulant.

Witnesses SAMUEL WEINBERG, MAI FILES.

salt of a fatty acid, glycerin, and hydrogen I f FRANK D. BELKNAP. a 

